Steam-generator



(No Model.) 2 sheets-sheet 1.

I. H. MURDICK. STEAM GENERATOR.

No; 361,228. Pa 'ggpted Apr. 12, 1887.

(No Model.) 2 S'heets sheet 2.

1. MURDICK. STEAM GENERATOR. No. 361,228. Patented Apr. 12,1887.

4 Mambo c lmL/fi UNITED STATES PATENT OFFICE.

' ISRAEL H. MURDICK, or HARTFORD, MICHIGAN.

STEAM-GENERATOR.

SPECIFICATION forming part or Letters Patent No. 361,228, dated April 12', 1887.

Application tiled August 81, 1886. Serial No. 212,327. (No model.)

To all whom it may concern.-

Be it known that l, ISRAEL H. MURDIOK, a citizen of the United States, residing at Hartford, in the county of Van Buren and State of Michigan, have invented certain new and use- 7 marked thereon, which form a part of this specification.

This invention relates to steam-boilers principally designed for agricultural purposessuch as cooking food for stock, heating water,

and supplying steam under a low pressure forany desired purpose.

The object ofv the invention is to produce a simple boiler economical in cost of construction, durable, and one that can be readily transported.

The improvement consists in the novel features hereinafter more fullysct forth and claimed, and shown in the annexed drawings, in which- Figure l is a side elevation, parts broken away, of the.improved device. Fig. 2 is a section of the same on the line X X of Fig. 1. Fig. 3 is a detail view of a portion of the front of the boiler, showing the door open and supported by the foot-piece. Fig. 4 is a sectional view on the line Z Z of Fig. 2. Fig. 5 is a sectional view on the line Y Y of Fig. 4.. Fig. 6

is a detached view, on a reduced scale, of the brace which is interposed between the shells of the boiler.

Theboiler proper is of the double-shell type, and comprises the inner and outer shells, A and A, and the bottom A. The outer shell is approximately of an inverted-U shape form in cross-section,'having the base formed preferably on the arc of a circle. The base of the inner shell is preferably straight and has the greater bulk of the water-compartment formed between it and the base of the outer shell. The space between the vertical walls of the shells is very narrow. The fire-chamber is formed wholly between the vertical walls of the inner shell and has the grate B located near the front and extended about fuel.

one-half the length, the remaining half being occupied by water-fines G, which depend from the end shell. flues 0 forms the back of the fire-pot, and prevents the fuel dropping off the grate. By having the firepot formed wholly within the inner shell and having the tubes 0 depending therefrom a large amount of heating-surface is presented, thereby producing a saving in A casing, D, projecting from the rear head of the boiler, receives the products of combustion which escape therefrom through the flue d.

The supplemental boiler E is removably held to the side of the outer shell by guides e, engaging flanges e projecting from opposite ends thereof. A tube or pipe, E, connected with the bottom of the boiler E, projects upward and is connected with the outer shell of the main boiler by a U-shaped connection, F. One end of said connection telescopes with the upper end of the tube E,-and the opposite end telescopes with the tube a, projecting from the outer shell of the main boiler. By this means water in the supplemental boiler E can be readily heated, and when so heated the boiler can be quickly detached and the main boiler used for other purposes, as will be readily understood.

The boiler is provided with a safety-valve composed of the short tube 9, the springplate G, having its rear end bent at right angles, forming a vertical support, 9, and its opposite end provided with a packing, 9 which normallycloses the end of the tube 9. The tension of the plate G is regulated by the threaded rod G and the thumb-nut G.

The shells composing the boiler are stayed by braces H, which consist of bars h h, bent into a shape conforming to each, and provided with short stays h, which prevent the bending or giving of the vertical limbs, and the longer brace, M, which is located near the base of the bar h. There may be as many of these braces as desired, and the shells are bolted or riveted thereto.

The firechamber is closed by a door, I, which is preferably hinged to the bottom A in such manner that when it is turned down it forms a receptacle to catch the coal and ashes which may accidentally drop from the grate or ash-pit, as shown by dotted lines in Fig. 1

The front of the waterand by full lines in Fig. 3. The outer end is supported bya foot, 1', which is hinged thereto in such manner that it will fold close to the door when the same is closed, and fall into a vertical position to support the door when open. Said footrest also serves as a handle when opening and closing the door. The lower portion of the supportis provided with a slide, J, through which a poker or other instrument is to be inserted for stirring or raking the fire. The bottom A is composed of two plates, 6 and 1), arranged at a distance apart, so as to inclosea spacewhieh is in communication with the space surrounding the sides and top of the boiler proper, thus having the fire-chamber inclosed within a double shell which surrounds it on all sides. By this construction the fuel is used to the best possible advantage and but little heat is wasted.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. A steam-boiler comprising two shells ap proximately of an invertedU shape in crosssection, forming a water-compartment between them, and a fire-chamber between the vertical sides of the double walls, the grate extending in a horizontal direction for a portion of the length of the fire-chamber, and the watertubes located at a distance apart and at a distance from the sides of the chamber, depending from the inner shell and extending parallel with each other in a horizontal direction the remaining length of said chamber and forming the back of the fire-pot, substantially 'as set forth.

2. The herein shown and described doubleshell boiler having the fire-chamber formed within and surrounded on its top and bottom and sides by the water-space, the grate located in the front portion of the fire-chamber, and the water-tubes, forming the back of the firepot, located in the rear portion of the firechamber and arranged at a distance apart and at a distance from the sides of the fire-chamber, substantially as and for the purpose described. t.

3. The combination, with the two shells approximately of an inverted'U shape in crosssection, forming the water-compartment between them, and the fire chamber between the vertical sides of the double walls, of the braces H, each composed of the bars h and h, conforming to theinner and outer shells, respect ively, the short stays h", and the brace h", substantially as shown and described.

4. The combination, with the boiler, the guides, and the removable supplemental boiler having flanged ends engaging with said guide, of a pipe connected with the bottom part of the supplemental boiler and projected upwardly, the short tube extending from the boiler proper, and the inverted- U shape tubular connection telescoping with the tube and pipe, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

ISRAEL H. MURDICK.

P XVitnesses:

G. W. MERRIMAN, GARRETT VON Vacuum-a. 

